Pulp Molding Machine Pre-Compression Drainage
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Solution Overview
Problem
Conventional pulp molding machines have low production efficiency due to long cycle times in the thermo-forming stage and a high risk of pulp molding article structure failure under large compression forces, primarily because they do not effectively drain water or vapor from the wet pulp before compression, leading to prolonged processing times and inefficient production.
Innovation Solution
A pulp molding machine that incorporates a pre-compression process using a first set of molds to drain water or vapor from the wet pulp, followed by a compression thermo-forming stage with a second set of molds, which applies controlled compression to densify the pulp fibers and shorten the production time, while also ensuring the integrity of the pulp molding article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thermo-forming stage applies large compression force to drain water or vapor from wet pulp, then the production efficiency is improved, but the structure of the pulp molding article is easily crashed
Solution Approach 1:
The compression process is divided into two distinct stages: a pre-compression stage using a first mold to drain water or vapor from wet pulp, and a thermo-forming stage using a second mold to apply controlled compression. This segmentation allows the heavy drainage function to be performed separately before the delicate forming operation, preventing structural damage while maintaining production efficiency.
Solution Approach 2:
The pre-compression stage performs the drainage action before the thermo-forming stage. By removing water or vapor from the wet pulp in advance using the first mold, the subsequent thermo-forming stage can apply larger compression forces without risking structural collapse, thus improving productivity while maintaining reliability.
2Reliability
If the thermo-forming stage takes long cycle time to drain water or vapor from wet pulp, then the structure integrity is maintained, but the production efficiency is reduced
Solution Approach 1:
The molding process is segmented into a pre-compression stage for drainage and a thermo-forming stage for forming. This division allows the drainage function to be performed efficiently in the pre-compression stage using a first mold, after which the thermo-forming stage can proceed faster with reduced cycle time while maintaining structural integrity through controlled compression in the second mold.
Solution Approach 2:
The pre-compression stage performs water or vapor drainage as a preliminary action before thermo-forming. This advance drainage reduces the moisture content of the wet pulp, allowing the subsequent thermo-forming stage to complete faster with shorter cycle times while maintaining structural integrity through the controlled compression process.
3Device complexity
If a single thermo-forming stage is used to process wet pulp, then the device complexity is low, but the production time is prolonged
Solution Approach 1:
The single thermo-forming stage is segmented into two distinct stages: a pre-compression stage using a first mold for drainage, and a thermo-forming stage using a second mold for controlled compression. This segmentation reduces the overall production time by performing drainage more efficiently in the pre-compression stage, while the added complexity of the dual-stage process is justified by the significant time savings and improved production efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the production time of the thermo-forming stage, enhances production efficiency, and prevents structural failures of the pulp molding article by reducing moisture content and applying controlled compression, resulting in a more efficient and reliable manufacturing process.
Implementation Method 1
performs a pre-compression process to drain off water or vapor from the wet pulp with high water content between a first upper mold and a first lower mold
Implementation Method 2
the wet pulp is thermo-compressed by and between a second upper mold and a second lower mold for shortening the production time
Data Source
AI summary
A pulp molding machine and a paper-shaped article made thereby are provided. The pulp molding machine comprises a machine frame body, a pulp-dredging stage, a compression thermo-forming stage and an edge-cutting stage disposed on the machine frame body. The pulp-dredging stage comprises a paper slurry tank, a first upper mold and a first lower mold, a wet pulp is dredged up by the first lower mold from the paper slurry tank, and is pre-compressed by and between the first upper mold and the first lower mold to form a first semi-finished product. The compression thermo-forming stage comprises a second upper mold and a second lower mold, the first semi-finished product is thermo-compressed by and between the second upper mold and the second lower mold to form a second semi-finished product. The edge-cutting stage is utilized for cutting superfluous edges of the second semi-finished product to form a paper-shaped article.